nanogui: /dev/fb0 questions
Subject:
Re: /dev/fb0 questions
From:
Martin Jolicoeur ####@####.####
Date:
28 Aug 2000 20:44:31 -0000
Message-Id: <39AACF51.D1C8613F@visuaide.com>
Having /dev/fb* doesn't mean framebuffers are compiled in your kernel.
Two things:
1- Make sure framebuffer support is enabled in your kernel ("make config"
in /usr/src/linux in your RedHat distro, then enable framebuffer support,
then "make install")
2- Make sure you enables framebuffer support in lilo(see document
/usr/src/linux/Documentation/fb/vesafb.txt) (Ex: add a line like
"vga=0x311" for a 16bits 640x480 config in the right config section in your
/etc/lilo.conf then type "lilo" to update the boot loader ) reboot
(If it works, you'll see a penguin in the upper left corner of the screen
at boot)
Good Luck
Martin Jolicoeur
GVT Project
####@####.####
####@####.#### wrote:
> Hello,
> I seem to be "missing" some part of the big picture for
> MicroWindows, and it all centers around /dev/fb0. As I understand it,
> this windowing system "works" with a frame buffer, which is a Linux
> character device, following the VESA 2.0 specification of a frame
> buffer. This frame buffer is configurable in terms of bitplane
> dimensions and color depth. The code of the driver itself is stored in
> libmwdrivers.a, and the /dev/fb0 "character file" is created with the
> mknod command, if not already available.
> When executing nano-X from the microwin/src/bin directory, a rather
> significant message is produced:
>
> Error opening /dev/fb0: No such device. Check kernel config
> Cannot initialise screen
>
> For further details on my system:
> it has an Intel Pentium Processor, over 100Mb of RAM, the ATI 3D Rage
> II+ 215GTB Mach 64 video card, which uses the PCI bus, and some benign
> monitor from Hyundai that apparently handles a fair variety of display
> modes. Running RedHat distribution, a fresh build of Linux 2.2.12.
> various frame buffer character special files listed:
> lrwxrwxrwx 1 root root 3 /dev/fb -> fb0
> crw-r--r-- 1 root root 29, 0 /dev/fb0
> lrwxrwxrwx 1 root root 8 /dev/fb0current -> /dev/fb0
> crw-r--r-- 1 root root 29, 32 /dev/fb1
> crw-r--r-- 1 root root 29, 64 /dev/fb2
> crw-r--r-- 1 root root 29, 96 /dev/fb3
> ...(on up to fb7)
>
> A few thoughts occur to me as to why I am faced with the message
> shown above. First, This powerful, late-model graphics card does not
> work with the offered frame buffer architecture. That seems unlikely,
> and perhaps even an errant hypothesis. Second, that I need to somehow
> register or interface /dev/fb0 with the /usr/lib/libmwdrivers.a library,
> which is where I am assuming the frame buffer drivers are actually
> implemented. Third, that there is some step missed from the
> installation process, which I only understand to be the "make install"
> as root from the microwin/src directory, something implied, beyond the
> makefile rules.
>
> Please help my fire up the ol' frame buffer here. I'm so eager to
> contribute, I just need to get my bearings.
>
> -Joe Solinsky
> ####@####.####
> Plymouth, MN
>
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